040 



E. Jl. J. SCHUSTER. 



Posterior Limbic Cortex (fig. V'^). 



23 GJ LD Gj cn 03 E] 

 CS Cn [3 C3 G3 GJ 



i3 CO czr nu C3 iXi CD 



The posterior limbic cortex is illustrated in fig. 13^ which is 

 taken from the mesial surface of the hemisphere just above 

 the posterior end of the corpus callosum. It differs from the 

 anterior limbic type in (1) a greater richness of cells, (2) the 

 ))etter development of the lamina granularis externa, (o) 

 the presence of a lamina granularis interna. Tlie lattei', 

 though clearly defined, is not so well developed as in the 

 inferior parietal or occipital types, wliich it resembles in some 

 respects. The lamina ganglionaris follows closely below the 

 internal layer of granules. It is well developed, the cells on 

 the whole being larger and more numerous than iu the strij) 

 actually drawn. 



Extent and l^oundaries. — The anterior limbic cortex 

 lies between the sulcus cinguli and the corpus callosum ; it is 

 continued forward as a broad band round the anterior end of 

 the latter. This anterior portion is separated from the frontal 

 cortex by an area intermediate in character. Posteriorly it 

 extends a little way behind the region of the mesial surface, 

 ill which the anterior precentral changes into the precentral 

 type. At this point, by the gradual acquisition of an internal 

 layer of granules, it becomes transformed into the posterior 

 limbic type. The latter extends lound the posterior end of 

 the corpus callosum, changing gradually above and behind 

 into the types of cortex on which it abuts. 



The posterior limbic coxtex corresponds to Brodmann's 

 type 23, the anterior to his type 24, while the area intei'- 

 mediate in character betweeu the limbic and the frontal is 

 ecjuivalent to his type 25. 



